I have a question in my assignment where i am not how to answer it.
A rectangular box with volume 7 cubic metres has a square base with side length x metres. Express the surface area S of the box as a function of x.
Surface area S = ?
I also have these two questions that are along the same lines that i also don't know how to properly solve.
2) The diameter of a spherical balloon is 12 cm. Air is pumped into the balloon to increase its diameter by x cm. Express the increase in volume of air inside the balloon as a function of x.
Note. The volume of a sphere with radius R is V=34 R^3
Answer: The increase in volume is equal to ? cm^3
3) A rectangle has its base lying on the x− axis and its upper corners on the parabola y=41−x2. If the upper right corner is (st), express the area A of the rectangle as a function of s.
The area A = ?
Thank you in advance.